Cant install ISAPI Filter on Win 2K8 server

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Win2003

Windows

ISAPI

I have written a demo ISAPI filter :

# include <windows.h> 
# include "httpfilt.h"

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;

	
}


/*
	GetFilterVersion - An ISAPI/Win32 API method
	This method is required by IIS.  It is called 
	following the process load to ensure that the 
	filter is compatable with the server.
*/

BOOL WINAPI GetFilterVersion ( HTTP_FILTER_VERSION *pVer )
{
	pVer->dwFilterVersion = HTTP_FILTER_REVISION;
	strncpy( pVer->lpszFilterDesc, "D3 Filter", SF_MAX_FILTER_DESC_LEN );
	pVer->dwFlags = SF_NOTIFY_PREPROC_HEADERS| SF_NOTIFY_SECURE_PORT| SF_NOTIFY_NONSECURE_PORT;
	return TRUE;
}


/*
	HttpFilterProc - ISAPI / Win32 API method
	This method is a required by IIS.  It is called
	for each notification event requested.  This is
	where the filter accomplishes its purpose in life.
*/
DWORD WINAPI HttpFilterProc(HTTP_FILTER_CONTEXT *pfc, DWORD NotificationType, VOID * pvData)
{
    DWORD dwRet;
    /*
		Direct the notification to the appropriate
		routine for processing.
    */
    switch ( NotificationType )
    {
    case SF_NOTIFY_LOG:
       // dwRet = OnLog(pfc, (PHTTP_FILTER_LOG) pvData );
        break;
    default:

        break;
    }
    return dwRet;
}</windows.h>

there is also a .def file associated with it :

LIBRARY	    T1
DESCRIPTION  'D3 Filter'

EXPORTS
    HttpFilterProc
    GetFilterVersion

Then, to install this filter i went to inetmgr and followed the relevant steps. But I when i click 'Apply' I get a msgbox saying "RPC Server Unavailable". So I started the RPC and RPC locator from services.msc ... but still i am getting the same message. Why is this happening ? How to fix this ?